Storyline!

The Shinsengumi have a new enemy rising from the darkness, an clan of Demon assassins. This clan goes by the Geidoushi. Though, the clan hadn't formed over night and its members were collected by skill and murder numbers. It's leader is known as the one eyed demon, due to him only having one eye. His objective is to slaughter the Shinsengumi, retrieving the young doctor and killing her. This man would later be revealed as the doctors very own brother and the very demon who slaughtered their village and his own family. Ikkoushen Iekaru.